PART 2 Early Agriculture: Answer to the CO2 and CH4 Mysteries?4. The Fertile Crescent and Europe5. China and Southern Asia6. The Americas7. Africa, Australia, and Oceania PART 3 Debating a New Hypothesis8. Early Farming and Per Capita Land Use9. How Should Interglacial Gas Trends Be Compared? 10. Natural Versus Anthropogenic CH4 Sources: Closer Scrutiny 11. Natural Versus Anthropogenic CO2 Sources: Closer ScrutinyPART 4 How Science Moves Forward 12. Falsification13. Paradigm Shifts 14. An Emerging Paradigm for the Anthropogenic Era?

PART 5 Early Human Effects on Climate15. Is the Next Glaciation Overdue?16. Other Climatic Effects of Early Land Clearance17. The End of Northern Hemisphere Glaciations

PART 6 Small Steps Back Toward an Ice Age18. The Little Ice Age 19. Were the Drops in CO2 and CH4 Natural?20. Mass Human Mortality and CO2 Decreases 21. Effects of Humans on Short-Term Greenhouse-Gas Reductions